Muffler.



W. HUNT. MUFFLER.

APPLICATION FILED JULY 3h I914- Patented Aug. 3, 1915.

WQWQOOQQ UNITED STATES PATENT OFFICE.-

WARREN M. HUNT, 0F AMIBOY, ILLINOIS, ASSIGNOR OF ONE-THIRD T0 CHARLES W.

' RABBIT .AND ONE-THIRD TO JOHN C. HUNT, BOTH OF AMBOY, ILLINOIS.

MUFFLER.

Specification of Letters Patent.

Patented Aug. 3, 1915.

Application illed July 31, 1914. Serial No. 854,341.

To all whom it may concern:

Be it known that I, WARREN M. HUNT, citizen of the United States, residing at Amboy, in the county of Lee and State of Illinois, have invented certain new and useful Improvements in Mufflers, of which the following is a specification.

This invention relates to mufiiers for ex plosive engines and has for its object the provision of a simple and inexpenslve device by the use of which the unpleasant and alarming noises due to the discharge of the exhaust of the engine into the open air will be diminished and practically eliminated.

A further object of the invention is to provide a device for the stated purpose in which the parts will be simple in construction and may be easily assembled in the course of manufacture or disassembled when cleaning or repairing is necessary.

Other incidental objects of the invention will appear as the description of the same proceeds and the invention resides in certain novelfeatures which will be particularly pointed out in the claims following the description.

In the drawings, which illustrate a muflier embodying my improvements, Figure 1 is a longitudinal section of the complete device. Fig. 2 is a detail view of a cap and cone. Fig. 3 is an elevation of the head at the inlet end of the mufiier with the parts carried by the same. Fig. 4 is an elevation of the discharge end of the muffler.

In carrying out my invention, I employ a tubular casing 1 which is preferably cylindrical and may be of any desired dimensions according to the size of the engine to which it is to be applied. This casing may be of any preferred material and will preferably be constructed of metal and provided with an asbestos lining, indicated at 2. The ends of the casing are closed by heads 3 and 4 which may conveniently be of wood or other material faced upon both sides with metal as indicated and which are provided with central openings to receive the end of the exhaust pipe 5 from the engine and a sleeve 6, respectively. The head 3 is secured firmly upon the end of the exhaust pi e 5 by nuts 7, as clearly shown, and to he said head I secure a strap 8 which extends diametrically across the head and is secured thereto at its ends by bolts or rivets 9. The central portion of this strap is arched, as shown clearly at 10 in Fig. 1, and to the ends of the same and the head, I secure a sleeve 11, the said sleeve having an internal annular flange 12 through which the said securing bolts or rivets are inserted and which is stepped to fit over the ends of the strap 8 without being spaced from the head through the remaining portion of its extent. The sleeve 11 is spaced from the inner wall of the casing, as clearly shown in Fig. 1, and extends inwardly to bear against a truncated cone which has its wider end bearing closely against the inner circumference of the casing and has its smaller end projected toward the exhaust pipe 55. secured at its ends to the said cone at the smaller end thereof and this strap is arched so as to fit against the conical cap 15 which has its apex projected toward the exhaust pipe 5 and bearing against the strap 10 at the center thereof and its wider end disposed concentric with but projected annularly beyond the smaller end of the truncated cone. Other cones 16 and caps 17 are provided in sufficient number to extend longitudinally through the entire casing and these caps and cones correspond in every respect to the caps 15 and cones 13 just described. The head 4 has the sleeve 6 secured therein by nuts 18 and 19 as shown, and to the outer side of the said head, I secure a down-turned nozzle or spout 20. To the inner side of the head 4 I secure an arched strap 21 similar in construction to the strap 8, and a connecting rod 22 has its ends fitted in the said straps 8 and 21 and secured therein by nuts 23 and 24 adapted to be turned home against the straps 21 and 8 respectively, as shown in Fig. 1 and as will be readily understood. Spacing sleeves 25 are fitted around the said connecting rod 22 between the successive caps and between the end cap 17 and the strap 21 so that when the nuts 23 and 24 'are turned home the several parts will The mufller having been assembled and secured upon the exhaust pipe 5, the exhaust gases escaping from the engine will enter the mufiier and will be deflected toward the sides of the same by the cap 15. As the gases cannot escape past the sleeve 11 and the cone 13 they will be turned inwardly toward the axis of the muifler and then pass under the edge of the cap between the same and the smaller end of the cone and then enter the cone through said smaller end and expand within the cone. The expanded gases will escape through the larger end of the cone but will be deflected by the inner wall of the casing so as to pass in rear of the cap 17 and then enter and pass through the cone 16. This tortuous circulation will be repeated and followed through all the successive cones and around all the successive caps and the spent gases will finally escape through the outlet sleeve 6 and the discharge spout 20.

The loud noises which ordinarily accompany the operation of an explosive engine are due to the sudden expansion of the exhaust gases upon reaching the open air and the consequent formation of a vacuum into which the surrounding air immediately rushes. By the use of my mufller the exhaust gases are prevented from expanding suddenly in the open air but are permitted a gradual expansion within a confined space so that there will be no sudden formation ofa large vacuum and consequently no sudden inrush of air toward said vacuum. Tortuous circulation imparted to the exhaust gases will permit them to almost entirely free themselves of their energy before escap- Having thus described the invention what is claimed as new is 2-- 1. A muflier comprising a series of alined cones, and conical caps arranged alternately with the cones and carried by the smaller ends of the respectively adjacent cones, the larger end of each cone inclosing and spaced annularly from the cap carried'by the succeeding cone.

2. A muffler comprising a series of alined cones open at both ends and all having their smaller ends projecting in the same direction, imperforate conical caps extending over the smaller ends of the respective cones and carried by and spaced from the same, the larger end of each cone inclosing the cap carried by the succeeding cone, and

means for securing the caps and cones in fixed relation.

3. A mufiler comprising a series of alined cones all having their smaller ends projecting in the same direction, a series of conical caps disposed alternately with and corresponding in number to the cones, each cap being carried by and spaced from and extending over the smaller end of the respectively adjacent co-ne, andithe larger end of each cone inclosing the cap carried by the succeeding cone, alined spacing sleeves between and bearing against the several caps and extending through the cones, and a connecting rod extending through said spacing sleeves and caps on the axes of the cones, sleeve and caps and provided with means for clamping the same in fixed relation.

4. A mufiier comprising a series of alined open-ended cones, a series of conical caps arranged alternately with the cones andextending over the smaller ends of the respectively adjacent cones, straps secured to the caps and the smaller ends of adjacent cones and supporting the caps in spaced relation to said cones, spacing sleeves between adjacent caps, and a connecting rod inserted through the several sleeves and caps and securing the several parts together, the larger end of each cone inclosing the cap carried by the succeeding cone.

5. In a muffler, the combination of a tubular casing, a series of alternate caps and cones extending longitudinally of the easing, the larger ends of the cones being in contact with the casing throughout their circumference, and the caps being carried by the smaller ends of the respectively adjacent cones in spaced relation thereto and inclosed by and annularly spaced from the larger ends of the respectively preceding cones, head closing the ends of the casing, a connecting rod connected internally to the heads and extending axially through the several caps, spacing sleeves upon said rod between the caps, and clamping devices on the ends of the rod.

6. In a muffler, the combination of a casing, a serie of cones disposed longitudinally within the casing, a series of conical caps extending over and carried by the smaller ends of the respectively adjacent cones and spaced therefrom, the larger end of each cone inclosing the cap carried by the succeeding cone, heads closing the ends of the casing, a sleeve carried by the head at the inlet end of the casing and extending therefrom to the adjacent cone and bearing upon sald cone near its outer edge, and means for securing the heads to the casing and the several caps and cones in fixed relation.

7. In a mufller, the combinatidn of a tubular casing, head closing the ends of the casing, arched straps secured to the inner sides of the said heads and projecting incone and bearing upon said cone near the outer edge thereof, and clamping nuts on the ends of the rods bearing against the adjacent straps to secure the heads to the casing and the several caps and cones in fixed relation.

In testimony whereof I affix my signature in presence of two witnesses.

WARREN M. HUNT. [L. s.] Witnesses:

R. W. RUGKMAN, H. H. HUNT. 

